WO2007128352A1 - Dispositif de mesure de débit massique - Google Patents

Dispositif de mesure de débit massique Download PDF

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Publication number
WO2007128352A1
WO2007128352A1 PCT/EP2006/062222 EP2006062222W WO2007128352A1 WO 2007128352 A1 WO2007128352 A1 WO 2007128352A1 EP 2006062222 W EP2006062222 W EP 2006062222W WO 2007128352 A1 WO2007128352 A1 WO 2007128352A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
mass flow
measuring
measuring surface
flow meter
Prior art date
Application number
PCT/EP2006/062222
Other languages
English (en)
Inventor
Steven Smets
Philippe Jans
Original Assignee
Katoen Natie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Katoen Natie filed Critical Katoen Natie
Priority to EP06755136A priority Critical patent/EP1987326A1/fr
Priority to US12/300,242 priority patent/US20090301220A1/en
Priority to PCT/EP2006/062222 priority patent/WO2007128352A1/fr
Publication of WO2007128352A1 publication Critical patent/WO2007128352A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
    • G01G11/04—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having electrical weight-sensitive devices
    • G01G11/043—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having electrical weight-sensitive devices combined with totalising or integrating devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/7088—Measuring the time taken to traverse a fixed distance using electrically charged particles as tracers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material

Definitions

  • the present invention relates to a mass flow meter for measuring the mass flow of a material supply flow of fluent particles, the mass flow meter comprising means for receiving the material supply flow and
  • the material conducting means comprise at least one guiding unit having a width for conducting the material flow through the mass flow meter along at least one flow direction, wherein the at least one guiding unit comprises at least one measuring unit with a measuring surface having a mean slope in relation to a horizontal and comprising velocity measuring means for determining a velocity with which the material flow is flowing over the measuring surface from an upper part towards a lower part of the measuring surface and force measuring means for determining a force exerted by the material flow to the measuring surface when flowing over the measuring surface,
  • the mass flow meter further comprising a processor for calculating the mass flow by processing the determined material velocities and forces.
  • EP-A2-1.205.737 discloses arrangements at an apparatus for measuring the mass flow of a material supply flow of fluent particles, by determining both the velocity with which the material flow is displaced over a measuring surface and the forces exerted by the material flow onto the measuring surface, per unit length of the surface.
  • the measured force is representative for the weight of the material per unit length of the measuring surface
  • the velocity is representative for the mean velocity with which the material is moving over the unit length of measuring surface.
  • the velocity is measured by an optical measuring device comprising a light source, which emits a light beam to the material supply flow.
  • the light reflected by the material flow of fluent particles against an array of photo detecting cells produces a signal, which is representative of a speckle pattern created by reflection of the light reflected on the particulate material.
  • the optical measuring means are positioned on a location where the velocity of the material supply flow of fluent particles reaches the mean velocity of the material supply flow of fluent particles.
  • the signal is processed by a calculator to an output signal which represents the velocity or travel speed of the material. The thus calculated velocity is then further combined with the weight of the material per unit length to obtain the mass flow of the material.
  • mass flow meter of the present invention is characterised in that
  • the means for determining the velocity of the flow of fluent material comprise at least a first and a second sensor placed at a distance from each other in flow direction of the material, the first and second sensor each being provided for gathering data on electrostatic charge of the material flowing, as a function of time,
  • the mass flow meter comprising a processor for converting the data on the electrostatic charge as a function of time to an output signal representing the velocity with which the material flow is flowing over the measuring surface.
  • the inventor has found that by measuring the electrostatic charge of the material flowing over the sensors as a function of time, the material flow speed can be determined with an improved accuracy.
  • the measurement of the electrostatic charge of the mass flowing over the sensors permits not only determining the speed of the bottom material layer which is in direct contact with the measuring surface, but also of the material layers located on top of that first layer.
  • the electrostatic charge measured by the sensors is namely not limited to the material layer that is directly flowing over the measuring surface, but includes a portion of an electrostatic charge of layers present on top of the bottom layer.
  • the electrostatic charge is inversely proportional to the square of the distance to that electrostatic charge.
  • the sensors will also measure the electrostatic charge provided by material layers present on top of the bottom layer.
  • the material of the bottom layer may travel over the measuring surface with a different velocity as compared to material layers located on top of it.
  • the measurement of the electrostatic charge takes account of this difference and thus permits an improved measurement of the velocity of the total material supply flow.
  • Electrostatic charge sensors have been found to be more sturdy and less sensitive to damages induced by the material flow, so that no corrections need to be done for that and the material flow velocity can be calculated with an improved accuracy. Besides that, electrostatic sensors have been found suitable for use with a broader spectrum of materials (dimensions, shape, chemical composition, optical properties ...) as compared to optical sensors.
  • the present invention presents the additional advantage that a more accurate determination of the velocity is obtained, since the velocity of the flow of fluent material is measured using at least a first and a second sensor positioned at a distance from each other in flow direction of the material, the determination of the velocity thus being based on two distinct measurements conducted on two distinct locations.
  • the contribution of the inevitable frictional forces to the force exerted by the material particles to the measuring surface, whereby the frictional forces act on the fluent particles in a direction parallel to the measuring surface, may be minimised by providing the force measuring means which are capable of determining a component of the force exerted onto the measuring surface which extends perpendicular to the mean slope of the measuring surface.
  • the at least one measuring surface is curved in the flow direction of the material.
  • the measuring surface is concave. More preferably, the at least one measuring surface has an arcuate shape with a virtually constant radius in the flow direction of the material.
  • the mass flow meter may comprise means for adjusting the mean slope of the measuring surface.
  • the mass flow meter according to the invention comprises means for accurately determining the mean slope of the measuring surface thus adding to the accuracy of the determined mass flow of the flow of fluent particles.
  • the measuring units are positioned symmetrical with respect to the material receiving means.
  • the mass flow meter preferably comprises multiple guiding units which are substantially identical and which divide the material flow of the fluent particles in several flows and flow directions, one flow direction per guiding unit. The inventors have found that by constructing a mass flow meter according to these embodiments, fluctuations in the mean slope can be accounted for, thus adding to the accuracy of the measurement.
  • the accuracy of the electrostatic charge measurement and thus the material velocity may be further improved by providing material conducting means comprising means for uniformly distributing the material flow over the full width of the guiding unit.
  • Optimum electrostatic charge measurement results are obtained if the measurement can be performed on the basis of a homogenous distribution with optimal thickness in which the speed of the particles is homogenously distributed.
  • the means for receiving the material supply flow comprise means for controlling the material supply flow.
  • the presence of material supply flow controlling means permits controlling the in-flow of the fluent particles, which in turn permits optimising the spreading of the material flow over the measuring surface and improving the accuracy of the measurement of the mass flow of the fluent particles.
  • the material supply flow controlling means used in the present invention may be any means known to the person skilled in the art, but preferably comprise a plurality of slideable plates which, when slid together, decrease the mass flow of the fluent particles and which, when slid away from each other, increase the mass flow of the fluent particles. If so desired, at least three sensors are provided in the measuring surface and the acceleration of the fluent particles over the measuring surface is measured. The measured acceleration can be used for a more accurate determination of the mass flow.
  • the invention also relates to a process for measuring the mass flow of a material supply flow of fluent particles.
  • the material supply flow is provided to the above described mass flow meter, the fluent particles flow along material conducting means comprising at least one guiding unit for guiding the flow of fluent particles along at least one flow direction over a measuring surface along a measuring unit towards an outlet, wherein the velocity with which the material flow of the fluent particles flows over the measuring surface is measured as well as the force exerted by the material flow to the measuring surface, whereafter the determined velocities and forces are processed in order to calculate the mass flow of the fluent particles.
  • the method of this invention is characterised in that the velocity is determined by gathering data on the electrostatic charge of the material flow as a function of time and in that the data on the electrostatic charge as a function of time is converted to a signal representing the velocity with which the material flow is flowing over the measuring surface.
  • Figure 1 shows a preferred embodiment of a mass flow meter according to the invention.
  • Figure 2 schematically shows the physical considerations for determining the mass flow of the material supply flow of fluent particles.
  • the preferred embodiment of the mass flow meter 1 as shown in figure 1 comprises means 2 for receiving the flow of fluent particles. These means 2 comprise a top opening 22 for receiving the flow of fluent particles and a bottom opening 23 comprising an inlet 24 guiding the flow of fluent particles to material conducting means 4.
  • the conducting means 4 guide the flow of fluent particles to an outlet 6.
  • the mass flow meter 1 according to this embodiment receives the flow of fluent particles by the receiving means 2 and guides the fluent particles in a downward direction towards the outlet 6 over the conducting means 4 along at least one flow direction 8.
  • the fluent particles When flowing over the conducting means 4, the fluent particles form a layer of fluent particles having a thickness of at least one layer of fluent particles.
  • the means 2 for receiving the material flow of fluent particles can receive the flow of fluent particles for example from a process using fluent particles, from a storage silo, from any sort of suitable storage facility for the fluent particles or from any other application deemed appropriate by the person skilled in the art.
  • the receiving means 2 can be permanently or removably mounted to the application providing the flow of fluent particles.
  • the shape of the receiving means 2 is not critical to the invention and can have any shape deemed appropriate to the person skilled in the art.
  • the receiving means 2 preferably comprise a flow controller for controlling the material supply flow by adjusting, i.e. increasing or decreasing, the material supply flow.
  • the flow controller is positioned at the inlet 24 of the flow of fluent particles to the conducting means 4 but its position is not critical to the invention as long as a representative part of the material flow is received through the flow controller.
  • Any flow controller considered suitable by a person skilled in the art can be used, but preferably co-operating slideable plates 3 are used.
  • the plates 3 are preferably slideably in such a way that the dimensions of the inlet 24 may be increased or reduced, to adjust the flow that is fed to the mass flow meter.
  • the mass flow meter 1 Downstream of the means 2 for receiving the material supply flow, the mass flow meter 1 comprises material conducting means 4.
  • the material conducting means 4 can be made of plastic or any other material found suitable to the person skilled in the art, but preferably they are made of metal.
  • the material conducting means 4 guide the flow of fluent particles along at least one flow direction 8. Thereto, along each flow direction 8, the material conducting means 4 preferably comprise at least one guiding unit 9 having a width for guiding the flow of fluent particles over its surface.
  • the guiding unit 9 preferably comprises means 7, more preferably a material flow spreader 7, for evenly distributing the flow of fluent particles in width direction over the surface of the guiding unit 9 in order to minimise differences in thickness of the layer of the fluent particles flow, thus adding to homogeneity of the layer of the fluent particles and to the accuracy of the mass flow measurement.
  • the material flow spreader 7 comprised in the guiding unit 9 functions to stabilise the turbulent particles flow leaving the receiving means 2.
  • the flow of fluent particles is spread open by the material flow spreader 7 in view of homogeneously distributing the particles into a layer with a thickness which is optimal for determining the mass flow.
  • the width of the guiding unit 9 and the opening created by the flow controller can be adjusted by the person skilled in the art.
  • the material flow spreader 7 extends from the inlet 24 and guides the particles flow along the flow direction 8.
  • the material flow spreader 7 comprises a flat plate having a length over which the fluent particles flow.
  • the guiding unit 9 can however also comprise other flow spreading means 7 found suitable by the person skilled in the art, for spreading the particle flow over the width of the surface of the guiding unit 9.
  • the length of the plate forming the flow spreading means, needed to obtain a homogeneous flow can be determined by the person skilled in the art.
  • the mass flow meter 1 Downstream the material flow spreader 7, the mass flow meter 1 comprises at least one measuring unit 20.
  • the mass flow meter 1 comprises at least one measuring unit 20, but the number of measuring units 20 is not critical to the invention and can be suitably adapted by the person skilled in the art.
  • the measuring unit 20 comprises a measuring surface 15 which has a mean slope 13 in relation to a horizontal 16 and a length 18.
  • the measuring surface 15 can be flat but according to a preferred embodiment of the invention is curved, preferably concave (hollow) in the flow direction 8 of the fluent particles.
  • the measuring surface 15 further comprises velocity 10 and force 5 measuring means.
  • the upper part of the measuring surface 15 connects to the bottom region of the material spreader 7 so that the layer of fluent particles is guided undisturbed to the measuring surface 15 and the homogeneity of the layer of fluent particles is not disturbed thus creating optimal measuring conditions for the measuring unit 20.
  • the velocity measuring means 10 measure the mean velocity v of the fluent particles while flowing over the length / of the measuring surface 15.
  • the measuring surface 15 is curved by a constant radius R and has a mean slope 13 a of an average plane 14 representing the measuring surface 15 with relation to the horizontal 16.
  • the fluent particles flow on the hollow side of the curved measuring surface 15.
  • the force measuring means 5 measure the mean perpendicular force F exerted by the flow of fluent particles onto the measuring surface 15.
  • the mass flow rh can be determined according to the following formula:
  • I v comprises the addition of two fractions.
  • the mean velocity v is constantly measured, changes in the velocity v due to different types of material, different physical characteristics of the measuring environment and/or changes in the composition of the material causing variable physical characteristics are taken into account when determining the mass flow fh of the material supply flow of fluent particles.
  • the position of the force measuring means 5 on the measuring surface 15 can be determined by the person skilled in the art and is not critical to the invention. However, in case multiple force measuring means 5 are present, they are evenly distributed over the measuring surface 15. Increasing the number of force measuring means improves the accuracy of the measurement of the mass flow.
  • the measuring surface 15 is seamlessly integrated with the remainder of the guiding unit 9, thus minimally disturbing the preferred one-layered homogeneous flow of fluent particles.
  • the mass flow meter 1 of this invention preferably comprises means 21 for adjusting the mean slope 13 so that the mean slope 13 of the measuring surface 15 can be adjusted in function of the physical characteristics (dimensions, shape,...) of the fluent particles so that an optimal flow of fluent particles can be achieved, therefore improving the accuracy of the measurement of the mass flow of the fluent particles.
  • the adjustable mean slope 13 also allows that inaccuracies in the mounting of the mean slope 13 can be compensated so that the accuracy of the measurement of the mass flow is further improved.
  • the velocity measuring means 10 preferably comprise at least a first 11 electrostatic sensor and a second 12 electrostatic sensor downstream of the first 11 sensor in the flow direction 8 of the particles, for detecting the electrostatic charge of the particles flowing over the measuring surface 15.
  • the first 11 and the second 12 electrostatic sensor are positioned on a distance x from each other in the flow direction 8 of the fluent particles.
  • the first 11 and second 12 sensor are seamlessly integrated in the measuring surface 15 so that the flow of fluent particles is not disturbed by the sensors and an optimal measurement of the electrostatic charge is obtained so that the accuracy of the measurement of the mass flow of the fluent particles is further improved.
  • the first 11 and second 12 electrostatic sensor record the electrostatic charge of the fluent particles flowing over it as a function of time as shown in parts 1 and 2 of figure 2.
  • the electrostatic charge amongst other things originates from friction of the fluent particles amongst each other and from friction of the fluent particles against the material conducting means 4. Since the electrostatic charge of the fluent particles generally remains stable, the second electrostatic sensor 12 generally records the same electrostatic distribution of the charge of the fluent particles as the first electrostatic sensor 11 as a function of time, only shifted over a period of time ⁇ t as shown in figure 2.
  • the period of time ⁇ t is the time needed for the fluent particles to travel from the first sensor 11 to the second sensor 12.
  • the velocity v can now be determined by dividing the distance x between the sensors by the time ⁇ t needed for the fluent particles to travel from the first 11 sensor to the second 12 sensor as shown in figure 2.
  • the electrostatic sensors 11 , 12 preferably are positioned so that the velocity v, which is determined based on the measured electrostatic charge of the fluent particles as a function of time, represents the mean velocity over the length / of the measuring surface 15.
  • the length x and / are nearly the same, more preferably the first 11 and second 12 electrostatic sensor are located at the upper and lower part of the measuring surface 15 thus adding to the accuracy of the measured velocity and thus to the overall accuracy of the measurement of the mass flow.
  • more than two electrostatic sensors 11 , 12, for example three, four or five may be provided, to improve the accuracy of the velocity measurement.
  • the precise number of electrostatic sensors can however be determined by the person skilled in the art. When at least three electrostatic sensors are provided in the measuring surface 15, the acceleration of the fluent particles over the measuring surface 15 can be determined, based on which a more accurate value for the particles mass flow may be determined.
  • the measuring unit 20 comprises a processor which converts the signal of the electrostatic sensors 11 , 12 representing the electrostatic charge distribution of the flow of fluent particles into a signal representing the velocity v of the flow of fluent particles.
  • the measuring unit 20 further comprises a calculator for determining the mass flow rh of the flow of fluent particles by combining the signal representing the velocity v with a signal from the force measuring means 5 representing the force F according to the preferred aforementioned relation.
  • the thus determined mass flow can then be fed to an external computer or can be directly visualised.
  • the mass flow meter 1 comprises means for determining the total mass flown through the mass flow meter 1 and means for feeding this result to an external computer or to means provided for visualising.
  • the material conducting means 4 comprise two guiding units 9 positioned on opposite sides of the material receiving means 2, and pointing in opposite directions therefrom. In case more than two guiding units 9 are present, they may be arranged circumferentially around the material receiving means 2.
  • the guiding unit 9 and measuring units 20 may be different, but preferably are substantially identical to each other and divide the material flow of the fluent particles in several flow directions 8, one flow direction 8 per guiding unit 9.
  • the flow of fluent particles flows to an output 6 opening where it can be collected in for example a storage volume of for example a truck, a storage silo or any other storage facility or can be fed to any other application deemed appropriate by the person skilled in the art.
  • the location, form and size of the output opening is not critical to the invention and can the determined by the person skilled in the art.
  • the mass flow meter comprises means for accurately determining the mean slope ⁇ 13, to permit variations in the mean slope 13 of the measuring surface 15 to be taken into account in formula 1 to further improve the accuracy of the mass flow measurement.
  • a combination is used of means 13 for determining the mean slope ⁇ and the adjacent circumferential mounting of the guiding units 9 around the material receiving means 2. This way an increased accuracy is achieved for the determined mass flow for the flow of fluent particles.
  • the interior of the mass flow meter 1 according to the invention is preferably accessible, for example through side-openings closed by doors.
  • the mass flow meter 1 comprises means, preferably made out of glass or acrylic glass, for viewing the flow of the fluent particles over the material conducting means 4.
  • the present invention also relates to a process for measuring the mass flow of a material supply flow of fluent particles.
  • a material supply flow is provided to the above- described mass flow meter 1 , in particular to the material receiving means 2 which guide the flow of the fluent particles to material conducting means 4.
  • the conducting means 4 comprise at least one guiding unit 9 for guiding the flow of fluent particles along at least one flow direction 8 over a measuring surface 15 comprised in the guiding unit 9 towards an outlet 6.
  • a measuring unit 20 determines the velocity with which the material flow of the fluent particles flows over the measuring surface 15 by measuring the electrostatic charge of the particles. Further, the force exerted by the material flow to the measuring surface 15 is measured. The determined velocities and forces are then processed in order to calculate the mass flow of the fluent particles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

La présente invention concerne un débitmètre massique (1) qui permet de mesurer le débit massique d'un flux d'alimentation de particules fluides. Ce débitmètre massique (1) comprend des moyens de réception (2) de flux d'alimentation de matière; des moyens d'acheminement de matière (4) permettant d'acheminer le flux d'alimentation de matière provenant des moyens de réception (2) vers une sortie d'évacuation de matière (6), lesdits moyens d'acheminement (4) comprenant au moins une unité de guidage (9) d'acheminement de flux à travers le débitmètre de masse (1) dans au moins un sens de flux (8), ladite unité de guidage (9) comprenant au moins une unité de mesure (20) dotée d'une surface de mesure (15) comprenant des moyens de mesure de vitesse (10) pour déterminer la vitesse à laquelle le flux de matière s'écoule sur la surface de mesure (15) de la partie supérieure vers la partie inférieure de cette surface (15), et des moyens de mesure de la force (5) pour déterminer la force exercée par le flux de matière sur la surface de mesure (15) lorsqu'il s'écoule sur ladite surface (15). Les moyens de mesure de vitesse (10) comprennent au moins un premier et un second capteur placés à une distance (17) l'un de l'autre dans le sens du flux (8) de la matière, ce premier (11) et ce second capteur (12) étant chacun conçu pour rassembler, en fonction du temps, des données relatives à la charge électrostatique du flux de matière. Le débitmètre massique (1) comprend un processeur permettant de convertir en fonction du temps les données relatives à la charge électrostatique en un signal de sortie qui représente la vitesse à laquelle le flux de matière s'écoule sur la surface de mesure (15).
PCT/EP2006/062222 2006-05-10 2006-05-10 Dispositif de mesure de débit massique WO2007128352A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP06755136A EP1987326A1 (fr) 2006-05-10 2006-05-10 Dispositif de mesure de débit massique
US12/300,242 US20090301220A1 (en) 2006-05-10 2006-05-10 Device for measuring a mass flow
PCT/EP2006/062222 WO2007128352A1 (fr) 2006-05-10 2006-05-10 Dispositif de mesure de débit massique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/062222 WO2007128352A1 (fr) 2006-05-10 2006-05-10 Dispositif de mesure de débit massique

Publications (1)

Publication Number Publication Date
WO2007128352A1 true WO2007128352A1 (fr) 2007-11-15

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PCT/EP2006/062222 WO2007128352A1 (fr) 2006-05-10 2006-05-10 Dispositif de mesure de débit massique

Country Status (3)

Country Link
US (1) US20090301220A1 (fr)
EP (1) EP1987326A1 (fr)
WO (1) WO2007128352A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7913576B1 (en) 2008-09-08 2011-03-29 Clarence Richard Flow scale with basket feature
US10007165B2 (en) 2012-08-01 2018-06-26 Merck Patent Gmbh Electrophoretic fluids
US10048562B2 (en) 2012-06-22 2018-08-14 Merck Patent Gmbh Electrophoretic fluid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7775422B2 (en) * 2003-06-13 2010-08-17 Arad Measuring Technologies Ltd. Meter register and remote meter reader utilizing a stepper motor

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1986002455A1 (fr) * 1984-10-09 1986-04-24 Auburn International, Inc. Mesure de l'ecoulement de fluides d'isolation
WO1993016356A1 (fr) * 1992-02-12 1993-08-19 Cimbria Unigrain Ltd. A/S Dispositif de mesure de debit massique
WO2001025732A1 (fr) * 1999-10-01 2001-04-12 Dynatechnik Messsysteme Gmbh Procede et dispositif de mesure de flux de matiere en vrac

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DE3717615A1 (de) * 1987-05-25 1988-12-15 Schenck Ag Carl Verfahren zur kontinuierlichen ermittlung der foerderstaerke eines schuettgutstromes und/oder zum kontinuierlichen dosieren von schuettgut und vorrichtung zur durchfuehrung des verfahrens
EP1130369A1 (fr) * 2000-02-29 2001-09-05 S.E.G. Mekanik Ab Dispositif de mesure de débit massique
SE522206C2 (sv) * 2000-10-31 2004-01-20 Seg Mekanik Ab Anordning vid apparater för mätning av massflödet hos främst partikelformigt material
DE102008011564A1 (de) * 2008-02-28 2009-09-03 Rembe Gmbh Safety + Control Vorrichtung zum Messen von Masseströmen

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1986002455A1 (fr) * 1984-10-09 1986-04-24 Auburn International, Inc. Mesure de l'ecoulement de fluides d'isolation
WO1993016356A1 (fr) * 1992-02-12 1993-08-19 Cimbria Unigrain Ltd. A/S Dispositif de mesure de debit massique
WO2001025732A1 (fr) * 1999-10-01 2001-04-12 Dynatechnik Messsysteme Gmbh Procede et dispositif de mesure de flux de matiere en vrac

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7913576B1 (en) 2008-09-08 2011-03-29 Clarence Richard Flow scale with basket feature
US10048562B2 (en) 2012-06-22 2018-08-14 Merck Patent Gmbh Electrophoretic fluid
US10007165B2 (en) 2012-08-01 2018-06-26 Merck Patent Gmbh Electrophoretic fluids

Also Published As

Publication number Publication date
US20090301220A1 (en) 2009-12-10
EP1987326A1 (fr) 2008-11-05

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